# Copyright 2021 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from pathlib import Path
import argparse
import typing as T

from mesonbuild import mlog

from .loaderbase import LoaderBase
from .loaderpickle import LoaderPickle
from .loaderyaml import LoaderYAML

from .generatorbase import GeneratorBase
from .generatorjson import GeneratorJSON
from .generatorprint import GeneratorPrint
from .generatorpickle import GeneratorPickle
from .generatormd import GeneratorMD
from .generatorman import GeneratorMan

meson_root = Path(__file__).absolute().parents[2]

def main() -> int:
    parser = argparse.ArgumentParser(description='Meson reference manual generator')
    parser.add_argument('-l', '--loader', type=str, default='yaml', choices=['yaml', 'pickle'], help='Information loader backend')
    parser.add_argument('-g', '--generator', type=str, choices=['print', 'pickle', 'md', 'json', 'man'], required=True, help='Generator backend')
    parser.add_argument('-s', '--sitemap', type=Path, default=meson_root / 'docs' / 'sitemap.txt', help='Path to the input sitemap.txt')
    parser.add_argument('-o', '--out', type=Path, required=True, help='Output directory for generated files')
    parser.add_argument('-i', '--input', type=Path, default=meson_root / 'docs' / 'yaml', help='Input path for the selected loader')
    parser.add_argument('--link-defs', type=Path, help='Output file for the MD generator link definition file')
    parser.add_argument('--depfile', type=Path, default=None, help='Set to generate a depfile')
    parser.add_argument('--force-color', action='store_true', help='Force enable colors')
    parser.add_argument('--no-modules', action='store_true', help='Disable building modules')
    args = parser.parse_args()

    if args.force_color:
        mlog.colorize_console = lambda: True

    loaders: T.Dict[str, T.Callable[[], LoaderBase]] = {
        'yaml': lambda: LoaderYAML(args.input),
        'pickle': lambda: LoaderPickle(args.input),
    }

    loader = loaders[args.loader]()
    refMan = loader.load()

    generators: T.Dict[str, T.Callable[[], GeneratorBase]] = {
        'print': lambda: GeneratorPrint(refMan),
        'pickle': lambda: GeneratorPickle(refMan, args.out),
        'md': lambda: GeneratorMD(refMan, args.out, args.sitemap, args.link_defs, not args.no_modules),
        'json': lambda: GeneratorJSON(refMan, args.out, not args.no_modules),
        'man': lambda: GeneratorMan(refMan, args.out, not args.no_modules),
    }
    generator = generators[args.generator]()

    # Generate the depfile if required
    if args.depfile is not None:
        assert isinstance(args.depfile, Path)
        assert isinstance(args.out, Path)

        # Also add all files of this package
        script_files = list(Path(__file__).resolve().parent.glob('**/*.py'))
        templates = list(Path(__file__).resolve().parent.glob('**/*.mustache'))

        out_text = f'{args.out.resolve().as_posix()}: \\\n'
        for input in loader.input_files + script_files + templates:
            out_text += f'    {input.resolve().as_posix():<93} \\\n'

        args.depfile.write_text(out_text, encoding='utf-8')

    generator.generate()
    return 0
